Cod sursa(job #1185264)

Utilizator hopingsteamMatraguna Mihai-Alexandru hopingsteam Data 15 mai 2014 12:41:56
Problema Ridicare la putere in timp logaritmic Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 0.63 kb
#include    <iostream>
#include    <fstream>

using namespace std;

ifstream fin("lgput.in");
ofstream fout("lgput.out");

int solve(int x, int n)
{
    x %= 1999999973;
    if(n < 0)
        return solve(1/x, -n);
    else if (n == 0)
        return 1;
    else if (n == 1)
        return x;
    else if (n % 2 == 0)
        return solve(((x * x) % 1999999973), n / 2) % 1999999973;
    else if (n % 2 == 1)
        return (x * (solve(((x * x) % 1999999973), (((n-1) / 2) % 1999999973)) % 1999999973));
}

int main()
{
    int x, n;
    fin >> x >> n;
    x %= 1999999973;
    fout << solve(x, n);
    return 0;
}